If you have to entertain a room full of millionaires who - all have an interest in finance - are varying ages (so may not enjoy the same music) - are from va

If you have to entertain a room full of millionaires who - all have an interest in finance - are varying ages (so may not enjoy the same music) - are from various countries (so may not be into the same sports) and you have the budget, someone like Yellen is absolutely a substitute good for e.g. having a private Ludacris concert. It's entertainment and continuing education in one. Plus your staff get to brag about the private event to their millionaire peers who did not get that perk.